Originally Posted by SamE30e
Holy lean, get a proper reading and tune that way. Considering a M42 has no way to detect knock I'd be very worried.
Your cylinder temps are probably insanely high, that's how I blew my M42.
What afr were you running when you blew it?
I've always heard that the m42 stock ran a little lean..
Im curious to know what the factory afr @ wot are vs a chipped m42 afr @ wot
I know there is timing to factor in but knowing the limits of those afr's may also determine the combustion efficiency that the motor can run leaner than most without damage. According to some engine builders ive been talking to...